March 21 zodiac sign

When the Sun enters Aries, year by year

The exact moment for every year from 1940 to 2035, and what that made March 21. Switch the time zone to match where you were born.

March 21 in the sky

March 21 is usually the first full day of spring. The equinox has just passed, so the Sun now sits north of the sky's equator, and daylight in the Northern Hemisphere runs slightly longer than night, gaining a few minutes each day. It is also the first full day of Aries, the sign that opens the zodiac. Aries is cardinal, one of the four signs that begin a season, and it is fire, the element of action and appetite. Traditional astrology says the Sun is exalted in Aries, meaning it works at full strength there, which suits a birthday that lands just as the days start to win out over the nights.

Aries on its first full day

Your Sun on March 21 is Aries in its freshest form, just past the starting line. Some astrologers call this opening stretch the initial degree and read it as raw, unpolished drive. In ordinary terms you may be the one who volunteers before the question is finished. Signing up for a race the night you hear about it is very you, and so is fixing a leaky tap at midnight with whatever tool is closest.

Mars rules Aries, and it tends to give you a short fuse with a short memory. You can snap at a slow driver and be laughing about it two blocks later, while the people around you are still recovering. That speed is a gift in a crisis and a strain in a long project, where the exciting first week gives way to months of upkeep. Pairing up with someone who enjoys the middle stretch helps. So does telling people, out loud, that your bluntness is not anger and that it passes in a minute.

The rare March 21 Pisces

A March 21 Pisces is possible, but only with an early-morning birth in certain years of the mid-1900s. In Eastern time the equinox spilled onto March 21 in some years from the 1940s through the 1970s, mostly in the hours after midnight, and it has not happened since. On the West Coast, three clock hours behind, the last such year came in the early 1960s. If your birth certificate shows an early-morning time from one of those decades, run it through the checker on this page. A Pisces born then is in the final minutes of the sign, and would likely recognize the softer, slower Pisces portraits more than the Aries ones.

Pisces or Aries: what changes

Watch how you argue. A Pisces in a disagreement tends to soften and apologize first, sometimes before it is fair to. An Aries says the hard thing plainly and is over it by dinner. That gap comes from the elements: Pisces is water, which takes feeling in, and Aries is fire, which acts on it. The modes differ as well. Mutable Pisces closes a season and adapts to it, and cardinal Aries opens the next one. The rulers pull apart too, with Jupiter and Neptune giving Pisces its wide imagination and Mars giving Aries its push. If you recognize yourself in the soft side, check your Moon or Mercury before you doubt your Sun.

Why a March 21 birthday can feel like both signs

There is no Pisces-Aries blend, and on March 21 you are rarely even close to the line. Plenty of March 21 people still feel part Pisces, mainly because of Mercury. The planet of thought and speech always stays within 28 degrees of the Sun, and on this date it is in Pisces for most people. That gives an Aries Sun a gentler way of explaining itself. Venus ranges from Aquarius to Taurus. With Venus in Aries, which tradition calls a hard spot for it, you tend to fall for people fast and say so. Your Moon sign (moods) and rising sign (first impressions) come from the full birth chart.

Share of people born on March 21, 1940 to 2030, calculated for noon Eastern time. About 62% have Mercury in Pisces.

A March 21 birthday

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